I'm having the same issue. At first the top would move only slightly, then 360 freedom, now it will lift like a mm from the other half. I can only hope it doesn't fall completely apart, but I know it probably will if it happened to a meticulous dude like Roger.The head is machined in two parts and bad luck for me I got it separated from a season/hot torching after I received it. So they send me a new one. I have been careful not to overheat but the two parts are moving, it's not a tight fit, I can turn all the way. I just hope this one doesn't end up in two pieces like the first.
That's how I felt, kept my gripe to the major one.The shaft is a bit wobbly too at first but becomes sturdy once oil builds up on the threads. I find this is less of a concern than a wobbly base.